Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3c565c8362a024…

MALICIOUS

PDF

74.4 KB Created: 2021-09-01 16:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: d7270cbe9eecb444cab0d21b2d46abd2 SHA-1: 4649f41a3f03a3dba5e1f858446582918c735403 SHA-256: fc3c565c8362a0248972e5d0a8661b5648b639ca3e2500bd23c9a3fe0ef45b15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised websites or disposable hosting. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common method for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=use+of+incentive+spirometer+for+pneumonia PDF link annotation
    • https://edu-mate.kr/_UploadFile/Images/file/meradifijapajodawugimo.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c31327e7b---fanerurafalifedinovevubam.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/lidojujotilape.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/vuvinopivifa.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/powedononipasituvovepaba.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/jojusevisexegimexib.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/76b8b11ebdb48b5aca2950933ee69d3e/nizomojiwinid.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7ca630e3---94914855868.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjpumsjien2i5asbbcbphndn4v/tedulevetozotuvowese.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/15561845205.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/0ioalfb721gr5fet4988g9pg1a/7278077575.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/gobowezegaloju.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/16473383617.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/42045137284.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f48cc3be676---47081080330.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/64370122702.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/71919312818.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210709065927.pdfIn PDF document text
    • https://aneri12.eu/res/file/donalexadonuzejetupawib.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/winal.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/keboxirigiluw.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/radivuvadezo.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/lipokediruseruwujozozave.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/xotifezimaxu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA0 10768 bytes
SHA-256: 14e8dbfc330e4a53652ba7383c0980ba1050ffaa5426420a480afcf67eb5b1dc
font_01_sfnt_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 16276 bytes
SHA-256: fd0329641b73500255c4348e58f7a3da106587736f294334660dcee51d111b01
font_02_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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